A beelogger on ESP32 basis, part 6: Test setup: The wind speed sensor (anemometer)

I bought a wind speed sensor from china, it’s a spare part for the “misol” weather stations, just search for “wind speed misol sensor aliexpress” for the product, it was less than 15€.

I unscrewed it to see how it works, technically it’s just a hall sensor.

For my test-setup, I simply cut off the connector (Don’t do this if you want to use it in combination with the wind direction sensor, it’s intended to be plugged in there!) and connected the wires directly to GND and GPIO4 and used the internal pull-up resistor:

Adding it to esphome is straight forward and easy. I’m using the pulse counter component, it uses the pulse counter peripheral of the ESP32 and works in standby-modes:

substitutions:
  update_interval: 5s

sensor:
 - platform: pulse_counter
   name: "Wind Speed Counter"
   id: windspeed_pulse_counter
   use_pcnt: true
   count_mode: 
     falling_edge: INCREMENT
     rising_edge: DISABLE
   pin:
     number: GPIO4
     inverted: true
     mode:
       input: true
       pullup: true
   unit_of_measurement: "km/h"
   icon: "mdi:windsock"
   update_interval: ${update_interval}
   filters:
     - multiply: 0.04
     - debounce: 10ms
   total:
     name: "Wind Speed Counter Total Pulses"

The value “0.04” is 2.4kmh/60s (to convert it from esphome’s pulses/min to km/h). The value 2.4km/h is explained here in the datasheets I found in this wiki that seem to match my hardware:
datasheet_1
datasheet_2